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so i just swapped the stock cam in my 318 to a comp cam that is 268/268 duration and 454/454 lift. at the same time i put on some heads that have been opened to 1.6 on the exhaust and 2.02 on the intake and put on a freshly rebuilt holley 650 vacuum secondary. now when i go to start it all it...

i have a set of 5.2 magnum heads sitting in my garage i was wondering what it would take or if it is possible to bolt them onto my '70 318 for a little more performance or if it would just be easier to rebuild the current heads.